[1] Univ N Carolina, Div Geriatr Med, Chapel Hill, NC 27599 USA
[2] Univ N Carolina, Ctr Aging & Hlth, Chapel Hill, NC 27599 USA
[3] Univ N Carolina, Cecil G Sheps Ctr Hlth Serv Res, Chapel Hill, NC 27599 USA
[4] Philadelphia Vet Affairs Med Ctr, Ctr Hlth Equ Res & Promot, Philadelphia, PA USA
[5] Philadelphia Vet Affairs Med Ctr, Natl PROMISE Ctr, Philadelphia, PA USA
[6] Univ Penn, Sch Nursing, Philadelphia, PA 19104 USA
[7] Univ N Carolina, Sch Publ Hlth, Dept Biostat, Chapel Hill, NC 27599 USA
[8] Univ N Carolina, Div Gen Internal Med & Clin Epidemiol, Chapel Hill, NC 27599 USA